package com.ajk.server.utils;

import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.Principal;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;

import org.springframework.core.env.Environment;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;

import com.ajk.server.security.AjkUserDetails;

public class AjkUtil {
	
	private static Environment env;
	
	public static String PINGXX_APP_ID = null;
	
	public void setEnv(Environment env) {
		AjkUtil.env = env;
	}
	/**
	 * Get GUID.
	 * 
	 * @return GUID
	 */
	 public static String GetGUID(){		
		return java.util.UUID.randomUUID().toString();
	}
	 
	/**
	 * 获取文件的扩展名 
	 * @param fileName
	 * @return
	 */
	public static String getFileExtension(String fileName){
		if(fileName!=null && !"".equals(fileName.trim())&&fileName.contains(".")){
			return fileName.substring(fileName.lastIndexOf("."));
		}
		return "";
	}
	
	public static AjkUserDetails getUserDetails(Principal principal){
		AjkUserDetails user = null;
		if(principal instanceof UsernamePasswordAuthenticationToken){
			UsernamePasswordAuthenticationToken pro = (UsernamePasswordAuthenticationToken) principal;
			if(pro!=null && pro.getDetails()!=null && pro.getDetails() instanceof AjkUserDetails){
				user =  (AjkUserDetails) pro.getDetails();
			}
		}
		return user;
	}
	
	public static String getClientIPAddress(HttpServletRequest request) {
    	String ipAddress = null;
		ipAddress = request.getHeader("x-forwarded-for");
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress = inet.getHostAddress();
			}
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
															// = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		if(ipAddress.equals("0:0:0:0:0:0:0:1")){
			ipAddress = "127.0.0.1";
		}
		return ipAddress;
    }
	
	public static String substring(String orignal, String channel,int length) throws UnsupportedEncodingException {
		// 原始字符不为null，也不是空字符串
		if (orignal != null && !"".equals(orignal)) {
			if("upacpupacp_wap".contains(channel)){
				if(charLength(orignal) >= length){
					int num = 0;
					StringBuffer buff = new StringBuffer();
					for(int i = 0; i < length ; i++){
						char c = orignal.charAt(i);
						int charLen = isChineseChar(c);
						num+=charLen;
						if(num >= length){
							break;
						}
						buff.append(c);
					}
					return buff.toString();
					
				}else{
					return orignal;
				}
				
			}else{
				if(orignal.length() > 32){
					return orignal.substring(0,length-1);
				}else{
					return orignal;
				}
			}
		}
		return orignal;
	}
	
	private static int charLength(String orignal) throws UnsupportedEncodingException{
		char c ;
		int len = 0;
		for (int i = 0; i < orignal.length(); i++) {
			c = orignal.charAt(i);
			int charLen = isChineseChar(c);
			len+=charLen;
		}
		return len;
	}
	
	private static int isChineseChar(char c) throws UnsupportedEncodingException {
		// 中文三个字节
		return String.valueOf(c).getBytes("UTF-8").length;
	}
	
	public static String getVaildate(){
		String valicode=MD5Tools.MD5(ThreadLocalSimpleDateFormater.getSimpleDateFormatYYYYMMDD().format(new Date())+"xianer");
		return valicode;
	}
}
